Apparatus for sharpening reamers



Dec. 25, H923. B. J. GUNDLACH,

APPARATUS FOR SHARPENING REAMERS Filed 0G11. 20. 1922 Patented Dec. 25, i923.

en A"ris g est BEN() J. GUNDLACH, 0F BELLEVILLE, ILLINOIS.

APPARATUS FOR SHARIENING REAMERS.

Application filed Qctober 20, 1922.

To all whom it may concern:

Be it known that I, BnNo J. GUNDLACH, a citizen of the United States, residing at Belleville, Illinois, have invented a certain new and useful Improvement in Apparatus for Sharpening Beamers, of which the following is a full, clear, and exact description,

such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an apparatus for sharpening reamers.

The main object of my invention is to provide a novel apparatus for sharpening reamers that can be adjusted easily to adapt it to reamers of different lengths and of different diameters. Other objects and desirable features of my invention will be hereinafter pointed out.

To this end I lhave devised a reamer sharpening apparatus which comprises a means for supportinga reamer,` a honing device that is adapted to be rubbed over the edges or outer ends of the blades or flutes of the reamer so as to restore the cutting edges of the blades to their original condition, and means for maintainingsaid honing device in such a position that it will bear squarely and evenly on the edges vor end surfaces of the blades of the reamer. The means that is used for supporting the reamer and preventing it from turning during the honing operation is constructed in such a way that it can be adjusted easily to adapt it to reamers of different lengths and different diameters, and the supporting means for the honing device is constructed in such a way that it can be adjusted to adapt it to reamers of different diameters and lengths or to vary thev pitch or angle of .the cutting edges of the reamer being honed.

Figure l of the drawings is a top plan view of a reamer sharpening apparatus constructed in accordance with my invention.

Figure 2 is a transverse sectional view, taken on the line 2 2 of Figure 1, looking in the direction indicated by the arrows; and

Figure 3 is a detail View, illustrating the kind of hone carrier that is used in case the reainer that is being sharpened has blades whose edges are slightly rounded.

Referring to the drawings which illustrate the preferred form of my invention, A and A designate devices that are adapted to be usedv for holding a reamer that is to Serial N0. 595,812.

be sharpened, B designates a device that is adapted to be used for preventing the reamer from turning and for properly positioning` the blades of the reamer, C designates Va hone secured to a hone carrier C and adapted to be rubbed over the cutting edges y of the blades of the reamer to sharpen thev same, and D designates a support on which the hone carrier C yis-adapted to be rested when the hone C on said carrier is being rubbed over the cutting edges of the blades of the reamer. In the form of my invention herein illustrated the devices A and A are so constructed and arranged that they will hold the reamer m in a substantially horizontal position and the support D is so positioned that the hone carrier C can be arranged at substantially right Iangles to the` reanier with the hone C bearing upon the;

center blade at the top side of the reamer, L

as shown in Figure 2.

The parts of the apparatusscribed can be constructed in various ways without departing from the spirit of my invention, but I prefer to adjustably mount either one or both of the devices A and A on a stationary frame and mount the support D and the reamer holding device B on said frame in such a way that they cany be adjusted longitudinally of said frame and also raised and lowered relatively to said frame, as hereinafter described, In ythe form of my invention herein illustrated the stationary frame just referred to comprises a horizontally-disposed base piece 1, a pair of integral legs 2 arranged at oneend of said base piece and a third leg 3 arranged at the opposite end of said base piece and adjustably connected to same in such a way that it can be adjusted longitudinally of abovey de- Y said base piece into any desired position and y then locked in its adjusted position by a clamping means 4 that is shown in dotted lines in Figure l. The reanier supporting device A consists of a pointed device; orv substantially cone-shaped device mounted in a vertically-disposed arm 5 that projects upwardly from the base piece lV to which vA and A.

ing 7 is split and is provided with a screw 9 or the 4like .that is vadaptedto be tightenedv so as to cause said bearing to clamp the screw 6 tightly enough to prevent it from turning after the reamerVA has V been clamped in operative position between the devices Various means may be vused for adjustably mounting the arm 8 on the base piece 1, but I prefer to make said base piece substantially triangular-shaped in cross Whenr the apparatusI is being Vused Jfor sharpeningla long reamer, the wing nut 1()a is loosened so as to permit the arm 8 to be adjusted"longitudinally of the base piece 1,v

to the right, lookin'gat vFigure 1, said wing nut'fbeing tightened after the arm 8 has been adjusted into the'` proper position, so

as to, securelyj clamp lsaidarmto the base piecelp.;y Whenja short reamer is to be sharpened therv arm '8 is adjusted longi-A tudinallyfof the base piece 1, to the left, looking a t Figur e 1, Vsoas to karrange said arm'closerfto the arm 5 which carries `the reamer holdin'ggdevice A. The screw v6 on which ,the devicjeAv ismounted provides for a slightvariatijon in the length of the space between-fthe devices A and A', butthe main j function of saidserew 6 'is to clamp the reamer rrnlybetween thedevices A and A after the arm8 hasbeen adjusted lin proper` position Von thevbase piece 1.

The support D for the hone carrier is preferably pivot-allyconnected at 11 to a bearing E v4that is slidingly Vmounted on the Xbaseipiece 1, and means is "provided for? threaded shank 15a relatively to the guide 16 Y clamping` said Ybearing to the `base Apiecel and for adjusting the support D sof as to Y change theelevationof the upper end of Til said support on which thehone carrier C rests.' In the ormof my invention 'herein illustrated vthe bearing E is providedfin its top side with a substantially tl-shaped notch or groove thatreceiveslthe basepiece 1, asv shown inFigure 2, and the means for clamping said bearing in adjusted position con; sistsfof abolt 12 projecting downwardly from the base piece 1 and provided with a wing nut 12a that is adapted to be tightened so as to move lthef bearing Evertically with relation to the base piecel, thereby causing the substantiallyV-shaped base piece 1.to

Vbe drawn into snug engagement with, the

tapered wallsof the groove in Vthe vtop side of the bearing E which receives said base piece. .The base piece lis provided with a longitudinally-disposed slot 13 of, sub stantially T-shape in cross section Vin which the bolt 12 is arranged in such a manner that the head of same is positioned inthe enlarged upper end portion of said slot, thereby permitting said bolt to slide longitudinally of the base piece 1 with the bearing E. lf desired, the bearing E can be provided with a still springf14, as shown in Figure 2, that laps over the top side of the basepiece 1, and thus prevents said bearing from dropping downwardly out of engagement with the base piece l in the' event the wing nut 12a on the screw 12 is removed. The device B previously referred tol that is used for preventing the reamer from turning preferably consists of a flat bladeV that kis slightly resilient and'which is secured to a horizontally adjustable member 14 mounted in the upper end of'averticallyfadjustable member llwhich is arranged at one sidev of the base piece 1 in 1 l laterally-projecting, bifurcated guide 16 on the bearing E. The member 15 is provided with an externally screw-threaded shanlr15'Lv and an adjusting nut l? is mounted on said shank between the two portions of the bifurcated guidelt, the

'holes in they portions of the guide 16through which the shank 15L passes ,being unthreaded..y When the nut 17j is turned in one direction the member 15 will be movedupwardly, and

through an internally screwfthreaded hole inthe member 15 isused formoving the member 14 horizontally, and said memberV 14 is provided with ay guiding device 19 having a horizontally-disposed portion that pro- V.jects through a hole in the shank r15a ot the Ymember 15, andthus prevents the member 14 from turning when the screw 18 lon the member 14 is turned to change the position lof the device B. Turningl of the screw-` through which said shank passes is prevented byrmea'ns of a feather or spline 20 on lsaid guide that projects intoan elongated slot 21` in the shank 15a that is shown in. broken lines los in Figure 2. By adjustingthe nut 17 the device 'B can be raised or lowered relatively Vto the reamer being sharpened, andby turn-y ing the swiveled screw 18 on the member 14 the device B can be moved towards'and In using the apparatus a reamer fz/ that is' to besharpened is clamped ina substantially horizontal positionwbetween the devices A and A by iirst. setting the arm 8 in proper position on the basepiecel and thenmanipign ulating the knurled finger piece 6? of the i ical means.

securely between the devices A and A. Thereafter, the nut 17 is turned in a direction to bring the member 14 into substantially parallel relation with the reamer, and the screw 18 is turned in a direction to cause the end of the device B to engage one of the blades or flutes of the reamer. 'Ihe hone carrier C is then arranged transversely of the reamer with the hone C bearing upon the center blade at the top side of the reamer, and the outer end portion of the hone carrier resting upon the upper end of the support D. If the hone does not bear squarely or evenly upon the flat end :face of the blade on which the hone is resting, the support D can be raised or lowered by manipulating a screw 22 ina depending lug 23 on the support D that bears against the bearing E, or the same result can be accomplished by manipulating the screw 1-8 so as to cause the device B to exert pressure on the reamer and turn it into such a position that the hone will bear evenly on the particular blade of the reamer which the hone then engages. rIhereafter, the nut 17 is turned in a direction to move the member 15 downwardly so as to place the device B under a slight tension, as shown in Figure 2. In the honing operation the hone carrier C is moved Jforwardly and backwardly and also lengthwise of the reamer to a limited extent, so as to cause the hone to sharpen the cutting edges of the blades of the reamer, the hone carrier being operated either manually or by any suitable mechan- A'ter one blade of the reamer has been sharpened, the nut 17 and screw 18 are manipulated so as to disengage the device B from the reamer and permit the reamer to be turned so as to bring another blade into operative position, after which the nut 17 and screw 18 are manipulated so as to cause the hone C to bear squarely on the next blade that is to be sharpened.

The particular shape or form of the hone carrier C is immaterial, but I prefer to use a hone carrier that is provided with a relatively long handle and a portion 24 at the front end of said handle to which a hone C can be connected by screws or other suitable fastening devices 25, the support D for the hone carrier being provided in its upper end with a convexed bearing surface 26 on which the underside of the handle of the hone carrier C rests and a pair of upwardly-projecting ears 27 at the opposite ends of said bearing surface that prevent the handle of the hone carrier from slipping off the surface 26 during the honing operation. In the event the reamer being sharpened has cutting blades whose end faces are slightly rounded, as shown in Figure 3, it is desirable to use a hone carrier C2 whose handle is provided on its underside with a concaved surface 28, as shown in Figure 3, so as to cause a slight rocking motion to be imparted to the hone,

and thus cause it to bear evenly on the rounded edge of the blade when the hone is moved back and forth over the blade. 1

It is possible Vwith an apparatus of the construction above described to sharpen a reamer accurately without materially reducing the diameter of the reamer. Moreover, such an apparatus can be adjusted quickly to adapt it to reamers of different lengths and different diameters.

Having thus described my invention, what i claim as new and desire te secure by Letters Patent is:

1. A honing apparatus for reamers consisting of a frame provided with a base piece, means for maintaining a reainer in a substantially horizontal position, a member combined with said base piece, a verticallyadjustable honing device support carried by said member and arranged at one side or' the reamer, and an adjustable reamer holding device on said member arranged in opposed relation to said honing device support.

2. A honing apparatus for reamers consisting or a frame provided with a base piece, an adjustable means for maintaining a reamer in a suhstantiallv horizontal position, a longitudinally-adjustable bearing on said base piece, a pivotally mounted.,I adjustable honing device support carried by said bearing, a reamer holding device on said bearing arranged in opposed relation to said honing device support, and means for enabling said reamer holding device to be raised and lowered and also adjusted towards and away form the reamer.

A honing apparatus for reamers consisting of a frame provided with a base piece, an adjustable means on said frame for maintaining a reamer in substantially parallel relation to said base piece, a longitudinally-adjustable bearing on said base piece, a support for a honing device projecting laterally from said bearing at one side of said base piece, means for raising and lowering said support, a reamer holding device arranged at the opposite side of said base piece, means for adjusting said holding device vertically relatively to said bearing, and means for adjusting said holding device towards and away from the longitudinal axisof the reamer. A

1i. A honing apparatus for reamers consisting of a frame provided with a base piece, adjustable elements on said Jframe between which a reamer can be positioned, a lengitudinally adjustable bearing on said base piece, a support for a honing device pivotally mounted on said bearing, means for adjusting said support, a resilient holding device adapted to be moved into engagement with the reamer to prevent it from rotating74 a horizontally-adjustable member to which said holding device is connected, and a verticallyadjustable supporting means for said member carried by said bea-ring. p.

5. A honing apparatus, for reamers oonsisting of av frame provided with a base piece, upright arms on said'frame provided with members between which a reamer can be positionechmeans for enabling one of said arms to be adjusted longitudinally of said hase piece, a longitudinallyeadjustable bearing on said base piece, a vertically-adjustable support on said bearing arranged at one side of the reamer and provided with 4 a surface on which a honing device can be rested during the operation of honing the reamer, means for preventing the honing device from slipping 0E said surface, a resilient device that is adapted to be moved ifrrsesr into engagementlwith thereamer te prevent' it from turning, and means for enablingY said reamer holdingj device/ato be adjusted vertieallryand horizontally. Y*

G. A honing apparatus for reamers', oomprising means for` holding alreamerin af substantially horizontal position, a support at one side osaid'reainer, ahone adapted to he rulolo'edoverl the portion ofV the reamer tofhe sharpened, and a carrier vfor said hone providedwith a Veoneaved surface that is adapted to ride upon said'supportv during' the honing operation whereby saidV carrier Will-be movedy upwardly and downwardly relativelyto said support. K

BENoJ. GUNDLACH. 

